The CAS Registry Mumber 168641-43-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,6,8,6,4 and 1 respectively; the second part has 2 digits, 4 and 3 respectively. Calculate Digit Verification of CAS Registry Number 168641-43: (8*1)+(7*6)+(6*8)+(5*6)+(4*4)+(3*1)+(2*4)+(1*3)=158 158 % 10 = 8 So 168641-43-8 is a valid CAS Registry Number.
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